.banner{
  width: 100%;
  img{
    display: block;
    width: 100%;
  }
}

main {
  padding-bottom: 11px;
  overflow: hidden;
  background: url("../images/introduce/main_bg.jpg") repeat-y center center;
  background-size: cover;

  > div {
    background-color: #fff;
    padding-top: 85px;
    box-shadow: 0 63px 16px 0 rgba(58, 73, 81, 0.16);
    img {
      display: block;
      width: 100%;
    }
  }
}
